Legumes gently incurved, obliquely ovoid-oblong, 8–15 × 3.3–4.2 mm, usually villosulous, rarely glabrous, hairs to 0.5–1 mm; stipe (3.5–)5–10 mm. Seeds (7 or)8–12.

Phenology: Flowering May–Jul.
Habitat: Dry grassy sites, on sandy or clay soils derived from basalt.
Elevation: 800–1100 m.

Distribution

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Oreg.

Discussion

In the southwestern corner of Morrow County and adjoining Gilliam County, Oregon, there are extensive and uniform populations of Astragalus collinus with glabrous fruits a little longer than the villosulous fruits of var. laurentii that may have resulted from introgression with A. curvicarpus var. subglaber. The indumentum of the herbage and impressed reticulation of the fruit are characteristic of A. collinus (R. C. Barneby 1964).

Selected References

None.

Lower Taxa

None.